Automatically turns your electrical equipment on or off according to the outside temperature. Plugs into any 120-volt receptacle or extension cord used in unheated areas. Provides 2 controlled receptacles. Ideal for auto, home, and farm on engine heaters, RVs, heat tapes, heat lamps, pump houses, livestock water tanks, boats, water pipes, and more. Save money by using power only when temperatures require it Maximum rating: 1800W/15A/120V. UL (Underwriter's Laboratories) listed.